/*
 * Copyright (c) 1993-1997, Silicon Graphics, Inc.
 * ALL RIGHTS RESERVED
 * Permission to use, copy, modify, and distribute this software for
 * any purpose and without fee is hereby granted, provided that the above
 * copyright notice appear in all copies and that both the copyright notice
 * and this permission notice appear in supporting documentation, and that
 * the name of Silicon Graphics, Inc. not be used in advertising
 * or publicity pertaining to distribution of the software without specific,
 * written prior permission.
 *
 * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
 * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
 * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON
 * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
 * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
 * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
 * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
 * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN
 * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
 * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * US Government Users Restricted Rights
 * Use, duplication, or disclosure by the Government is subject to
 * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
 * (c)(1)(ii) of the Rights in Technical Data and Computer Software
 * clause at DFARS 252.227-7013 and/or in similar or successor
 * clauses in the FAR or the DOD or NASA FAR Supplement.
 * Unpublished-- rights reserved under the copyright laws of the
 * United States.  Contractor/manufacturer is Silicon Graphics,
 * Inc., 2011 N.  Shoreline Blvd., Mountain View, CA 94039-7311.
 *
 * OpenGL(R) is a registered trademark of Silicon Graphics, Inc.
 */
package cglesson.lesson01;

import org.lwjgl.input.Mouse;
import org.lwjgl.opengl.GL11;

import cglesson.CGExample;

/**
 * This is a simple double buffered program.
 * Pressing the left mouse button rotates the rectangle.
 * Pressing the middle mouse button stops the rotation.
 * Ported by 
 * @author <a href="mailto:eriq.adams@gmail.com">Eriq Muhammad Adams J.</a>
 */
public class Double extends CGExample {

	private float spin = 0.0f;
	private boolean spinEnabled = false;

	@Override
	public void init() {
		GL11.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
		GL11.glMatrixMode(GL11.GL_PROJECTION);
		GL11.glLoadIdentity();
		GL11.glOrtho(-50.0, 50.0, -50.0, 50.0, -1.0, 1.0);
	}

	@Override
	public void update(int delta) {
		/** if left button pressed rotate rectangle */
		if (Mouse.isButtonDown(0)) {
			spinEnabled = true;
		}
		/** if right button pressed stop rotating rectangle */
		if (Mouse.isButtonDown(1)) {
			spinEnabled = false;
		}

		spinDisplay(spinEnabled);

	}

	public void spinDisplay(boolean enabled) {
		if (enabled) {
			spin = spin + 2.0f;
			if (spin > 360.0f)
				spin = spin - 360.0f;
		}
	}

	@Override
	public void render() {
		/* clear color to black */
		GL11.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
		/* clear color buffer */
		GL11.glClear(GL11.GL_COLOR_BUFFER_BIT);
		GL11.glPushMatrix();
		GL11.glRotatef(spin, 0.0f, 0.0f, 1.0f);
		GL11.glColor3f(1.0f, 1.0f, 1.0f);
		GL11.glRectf(-25.0f, -25.0f, 25.0f, 25.0f);
		GL11.glPopMatrix();
	}

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		Double example = new Double();
		example.start(250, 250, false, "Double Example");
	}

}
